I am wondering if my tank is overstocked or close to it, ty!
I'm not familiar with the wood cat, but unless they get large you're fine.
I think it's perfectly fine where it is. To my knowledge, the wood catfish gets to around 5 inches.
this tank sounds amazing and definitely not over stocked! you could add in some more fish if you wanted! I would recommend doubling your school or maybe adding in some more gouramis.
good luck with your tank!!